CAJ | 학술논문

对粒径为12μm的天然鳞片石墨进行表面碳包覆改性，并对包覆前后样品的微观结构和电化学性能进行了研究。结果表明：包覆改性提高了天然石墨的振实密度、表面形貌和电化学性能，在0.1C、0.2C、0.5C、1C、2C、5C和10C倍率下，对应的可逆容量分别为368.6 mAh/g、362.6 mAh/g、353.8 mAh/g、340.6 mAh/g、298.6 mAh/g、228.2 mAh/g 和150.2 mAh/g，相对于天然石墨，可逆容量分别提高了6.2 mAh/g、20.9 mAh/g、31.6 mAh/g、42.1 mAh/g、52.4 mAh/g、80.0 mAh/g 和58.0 mAh/g，碳包覆小粒径天然石墨表现出的良好的倍率性能，有望应用于电动车用锂离子电池中。
대립경위12μm적천연린편석묵진행표면탄포복개성，병대포복전후양품적미관결구화전화학성능진행료연구。결과표명：포복개성제고료천연석묵적진실밀도、표면형모화전화학성능，재0.1C、0.2C、0.5C、1C、2C、5C화10C배솔하，대응적가역용량분별위368.6 mAh/g、362.6 mAh/g、353.8 mAh/g、340.6 mAh/g、298.6 mAh/g、228.2 mAh/g 화150.2 mAh/g，상대우천연석묵，가역용량분별제고료6.2 mAh/g、20.9 mAh/g、31.6 mAh/g、42.1 mAh/g、52.4 mAh/g、80.0 mAh/g 화58.0 mAh/g，탄포복소립경천연석묵표현출적량호적배솔성능，유망응용우전동차용리리자전지중。
The natural flake graphite with the particle size of 12 μm was coated by a layer of pitch , and the microstructure and electrochemical performance of natural flake graphite and surface modified graphite were studied .It was showed the surface modified graphite with high tap density , surface morphology and excellent electrochemical performance.The capacities of modified graphite were 3368.6 mAh/g, 362.6 mAh/g, 353.8 mAh/g, 340.6 mAh/g, 298.6 mAh/g, 228.2 mAh/g and 150.2 mAh/g, corresponding to the rates 0.1 C, 0.5 C, 1 C, 2 C, 5 C and 10 C, which increased to 6.2 mAh/g, 20.9 mAh/g, 31.6 mAh/g, 42.1 mAh/g, 52.4 mAh/g, 80.0 mAh/g and 58.0 mAh/g, relative to natural graphite.The good rate performance of carbon coated small -sized natural graphite for lithium -ion battery made it a promising candidate as anode materials for electric vehicle dynamic 1ithium-ion batteries.